Weeds love Warm and Moist Conditions

Jun 02, 2016

Wild oats and green foxtail are growing “like crazy” and rain will bring a flush of broadleaf annuals. In-crop herbicide applications are best done as early as possible.

The first in-crop herbicide opportunity varies by HT system and by tank mix. Glyphosate can go on Roundup Ready canola at basically any time up to the 6-leaf stage. Liberty can go on at emergence of Liberty Link canola. In the Clearfield system, the first application of IMI products can go on at the 2-leaf stage of the crop. Read more on crop staging.

Earlier is better. Research has demonstrated an advantage of 3 bu./ac. for controlling weeds at the 1-2 leaf stage of canola versus the 3-4 leaf stage, and a 7 bu./ac. advantage for the 1-2 leaf stage versus the 6-7 leaf stage.

These numbers will be even higher if a preseed burnoff was not completed. If the crop is seeded without a pre-seed burnoff, in-crop weed control should occur as early as possible. Canola is much more vulnerable to weed competition prior to reaching complete ground cover. Smaller weeds are also much easier to kill than weeds at the 4-leaf stage or later.

Rain has kept sprayers off fields. The longer a herbicide sits in a sprayer, the greater the risk that it is going to hang up in the tank. Sprayers should be cleaned at the end of every work day regardless if the same product or tank mix is being sprayed the following day.

Source : Albertacanola

Video: Dr. Emerson Nafziger: Nitrogen Fertilizer Rates for Corn

The Crop Science Podcast Show, Dr. Emerson Nafziger from the University of Illinois breaks down decades of nitrogen research. From the evolution of N rate guidelines to how soil health and hybrid genetics influence nitrogen use efficiency, this conversation unpacks the science behind smarter fertilization. Improving how we set nitrogen fertilizer rates for rainfed corn is a key focus. Discover why the MRTN model matters more than ever, and how shifting mindsets and better data can boost yields and environmental outcomes. Tune in now on all major platforms!

"The nitrogen that comes from soil mineralization is the first nitrogen the plant sees, and its role is underestimated."

Meet the guest:

Dr. Emerson Nafziger is Professor Emeritus of Crop Sciences at the University of Illinois at Urbana-Champaign, with degrees in agronomy from Ohio State, Purdue, and Illinois. His research has focused on nitrogen rate strategies and crop productivity. He co-developed the Maximum Return to Nitrogen (MRTN) model, which is widely used across the Midwest. His research spans N response trials, hybrid interactions, crop rotation effects, and yield stability.